Abstract: Abstract:By systematically studying SOA theory system and J2EE key technology, this paper analyzes the present situation of supplies purchasing in Henan Energy and Chemical Industry Group Co,.Ltd. And then based on the actual requirement, this article tries to combine the design of web service and SOA theory system to build the e-commerce purchasing platform of Henan Energy and Chemical Industry Group Co,.Ltd (Purchasing platform for short). According to the construction, implementation, and effect of the purchasing platform, this article tries to explain one fact. The fact is that the management practices of “internet + material supply” helps the group save purchase fund as much as 6.3 billion in the “quality, efficiency, out of difficulty, transition” context. The application of purchasing platform has many advantages, such as promoting management innovation, optimizing purchasing process, reducing purchase cost, saving purchase fund, and then realize sunlight procurement. We hope we can provide valuable experiences for the large-scaled group corporation on the “internet + material supply”.